1 . 137 1: . : . eliminated the Cs source term from the diet and limited the dose equivalent received by this population. The contribution of 905. to the bone marrow dose equivalent commitment was small relative to the contribution from external exposure and 13766, AS resi- dence intervals increased, and food products with higher 905, concentrations _ became more available, then the body burdens and bone marrow dose equivalents would have correspondingly increased. The total body and bone marrow totai dose equivalent commitments have a standard deviation of 40% in the adult subgroups. For residence periods between the years 1969 and 1978, a maximally exposed person received a total dose equivalent commitment of 30 mSv (3 rem) and the population average total dose equiva- lent commitment was 12 mSv (1.2 rem) due to man-made radioactivity on Bixini IsLand. ACKNOWLEDGEMENT We would like to express our sincere appreciation to Dr. Robert A. Conard and Stanton H. Cohn, Ph.D., Brookhaven National Laboratory, Medical Department for their advice and assistance during the initial setup, preliminary operations and transfer of responsibility for bioassay services to our Division. The field portion of the radiological survey of the Marshall Islands was accomplished by an intense and diligent effort on the part of the contributors listed for this document. We are also deeply indebted to those contributors who complemented the field work by performing radionuclide analyses and by pretesting equipment prior to use in the field. The survey crew extends its thanks to the Nevada Operations Office and Pacific Area Support Office for support services which result in a smooth and effi- 19